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Study on the low frequency instability in the near wake of a circular disk

  • Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China

Cite this: JUSTC, 2014, 44(11): 952-959
https://doi.org/10.3969/j.issn.0253-2778.2014.11.010
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  • Received Date: September 23, 2014
  • Revised Date: October 26, 2014
  • Published Date: November 29, 2014
    Abstract
  • Based on data of LES (large eddy simulation) and hot wire anemometry, the low frequency instability in the near wake of a circular disk at Re=104 was studied by wavelet analysis and FFT method. It is found that, besides Kelvin-Helmholtz frequency StKH≈16 and vortex shedding frequency StV≈014, there are two low frequencies, namely StL1≈002 and StL2≈003. Further study shows that the two frequencies are correlated with the azimuthal motion of the vortex shedding location and the pumping motion of the recirculation region, respectively. The study presents a reasonable explanation of the scattering in the value of the low frequency in the near wake of the bluff body.
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